[mustangmendez]

Ren Man
Steve mentioned maybe a rubber hose may be collapsing ,
on the suction side of your pump replace any rubber hose with steel line it may be your problem if the fuel pump does not fix it .
I would be best NOT to run any rubber hose on the suction side of your fuel pump because your mechanical pump is made to suck fuel .
If you go with an electric pump always place it as close to your fuel tank as possible they are made to push Not suck !
We hade a Pontiac 400 eng in a 1965 Ford farm truck and when we would stand in the pedal it wound fall on its face due to a New cheap 3/8 fuel hose on the suction side ! If it can happen it has happened to me but I still love the sound of a bad V8....
Mustang Mendez